Find a region of eight neighbouring squares, that contains all the numbers 1-8.\

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html[5] = html[4];
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Fill the blanks so that the first 7 rows and the first 7 columns contain the numbers 0-6 only once. The 8th row and the 8th column contain the sums of the diagonals. Diagonals of the same color have the same sum.\

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html[7] = html[6];
html[8] = '\ \

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Fill the blanks so that each number belongs to a group of the same number of neighbouring squares. There are 11 groups (2 of 8s, 2 of 7s, 2 of 6s, 2 of 5s and 3 of 4s).\

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html[9] = html[8];
html[10] = '\ \

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Fill the blanks so that each line, each column, all 2x4 blocks, as well as squares with the same colour, contain the numbers 1-8.\

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html[11] = '\ \

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Fill the blanks so that each line, each column, all 2x4 blocks, as well as squares with the same colour, contain the numbers 1-8. Neighbouring squares (vertically or diagonally) must not contain the same number!\

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html[12] = '\ \

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Fill the blanks so that each line, each column, all 2x4 blocks, as well as squares with the same colour, contain the numbers 1-8.\

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html[13] = '\ \

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Gray as many 2x2 square blocks as you can! Gray blocks must be neither horizontally nor vertically adjacent. Each + is contained in some gray block, while no X belongs to any of them.\